// 回到顶部

/**
 * 销毁新闻或产品导航栏存储的Id
 */
function destroyId() {
    //渲染之后销毁
    sessionStorage.removeItem("id");
}

document.writeln("<div class=\'href-top\'>");
document.writeln("        <a href=\'#\' onclick='destroyId()'>");
document.writeln("            <img src=\'../img/nav.png\' />");
document.writeln("        </a>");
document.writeln("    </div>");